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BQ27427EVM: Learning Cycle with bqStduio cannot be proceeded

Masaaki Tahara
Prodigy 20 points
Part Number: BQ27427EVM
Other Parts Discussed in Thread: BQSTUDIO, BQ24232, GPCCHEM, BQ27426, BQ27427

Tool/software:

Hello,

We are trying to use BQ27427EVM boards with bqStudio for proceeding learning process of our Li-ion battery.

Even if I tried to set Design capacity, Taper current, dsg/chg current threshold, quit current and term voltage according to our Li-ion battery specification, Lerning cycle on bqStudio cannot be proceeded like attached video.

Please kindly let me have your advice what I could check on such problem on bqStudio.

Our battery specification is 505mAh capacity and charger is bq24232.

  • 0
    TI__Mastermind 26945 points

    Hello Masaaki,

    Could you attach your results from GPPCCHEM calculator? It seems like the ChemID you went with could be the root of the issue, typically you want to see a error difference of 3% when using a chemID.

    GPCCHEM:
    https://www.ti.com/tool/GPCCHEM

    Thank you,
    Alan

  • 0 in reply to Alan Frias
    Prodigy 20 points

    Hello Alan,

    Thanks for your feedback.

    I have not completed GPCCHEM calculator process with our battery pack yet, so I'll try to complete GPCCHEM calculator process, first as you gave advice.

    Thanks,

    Tahara

  • 0 in reply to Masaaki Tahara
    TI__Mastermind 26945 points

    Hello Masaaki,

    Sounds good please feel free to ask question on this trend and no need to message back.

    Thank you,
    Alan

  • 0 in reply to Alan Frias
    Prodigy 20 points

    Hello Alan,

    Thanks for your feedback.

    I have tried to complete GPCCHEM calculator process with our battery pack and I got Gauging Parameter Calculator Report as below.

    Device / Family #3
    Generic Chem ID Device/ Voltage/ Chemistry max DOD error, %
    3230 bq27426: (default) 4.35V LiCoO2 2.85
    3142 bq27426: (ALT-CHEM2) 4.4V LiCoO2 3.48
    1202 bq27426: (ALT_CHEM1) 4.2V LiCoO2 8.87
    Best generic ID 3230
    Max. deviations for best generic ID is within recommended range. Please chose this ID in your device configuration or device family.

    In that case, would it be possible to use BQ27427 with Chem ID 3230 for our battery pack?

    Since Chemistry max DOD error is below 3.0% if we used Chem ID 3230 for our battery pack according to Gauging Parameter Calculator Report.

    Thanks,

    Tahara